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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86608219ee5b1b9a7138aa8c6ec78f6998c2117d6a6c096d5f8f6d3e7dbecf1' 
  AND token = '1Z4RAM1fFbBb8fbFIRHVrzBxoj5/MJZMzBJQ11k8hPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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