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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726286cf58e355736e1a86cc7ed76bef1e23318e22b71b583e7eea8c0706a631' 
  AND token = '1QVx4KuaYPKlQCoIKKWTjgI+dKI9NboBqUaOfkwCzao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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