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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee96892e596abfe9b82525164968948a6312f8ae232dc91b8379f8ac7928adc7' 
  AND token = 'dgtosfZRk9ln8dN1wGhf9LlnTJkADQ2qc3FuR1UxqSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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