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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572a5b006da2aa06e7867b73d9f38b7997bacfa96cf02ba54c5d3e829b548263' 
  AND token = 'jQ9JgvrX1zCgL5M2840lSi+K85rn0elK9YyM3UFGUpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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