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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f14af0b361f3aee7e2c017f4f0aeaae45922ba50ceef14c836397a870ecc8a' 
  AND token = 'pgwxA4ih6yZspwe5HM3BgGAMlwfm2Awjx6zpMKLwe6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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