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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79aa209878a1fbcdf4ff9d98026086b3909d2b733a1cbd449143f0ef7f072f31' 
  AND token = 'qduCfW4MZN/RYV0CadQcmU1fIZqU0kklMI8FLWsMLeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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