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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac38bf133d3e943d897accf0a685db78b1f5beab95a7f0b5e51ca4305571daef' 
  AND token = 'q9T8CYUr9imTBXL8dyePBf8mmJ6a5RbD+R8ifvXQA+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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