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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68822a03ac5a0b27f9406aad37eae5e7013972f3361debb4641d791b2aae7a9' 
  AND token = 'n6CadOrvaB1CA3cSPIp0ponRf9nOytDF7p47ydm28Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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