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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcbc05ae0cdb231b6168c1f6d64003321aaf70a67d96b5200a313fe2d084418' 
  AND token = 'oCnIThVabwq1KSffI8k82wR2h8yhgm3g1V6sdzsNPiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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