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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bca0aed135ea60686c3b01305d7c028b6ed4fb5404b24779fcbab61c1add30' 
  AND token = 'QR211U9gSAfUq6Y0Xpl1PKd6CUanONbJ+NO4kQDu3Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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