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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba5ad55f944f4d2bc1219b4f3c98d4ca35c036db29fe3a192affb54487be453' 
  AND token = '2yOmQPlqoeA1Km37Z/e2m0DSHBkRtgfFVfVzuLqT99E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}