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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9b86eb6eaf734a40e1a580d49c2e4dab59d4073b26771c6aa2f71a90e04ee6' 
  AND token = 'mVT/dOJhBXr6Xb/BFkgVJkGGkNL+a1+tzVlLRmgp0rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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