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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110f05a3915a7a4f9a9b96e5eda43912b69388717062591b8f64c860d88e575b' 
  AND token = 'gzztzXR3IGxXd3Jw7Q2+eTfT0y8srHj6ElXe78ddeLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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