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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bd22107315b84c4477271fa780973a3dd11fbeb1cf863667c887d35aa2f0ed' 
  AND token = '7MlCl0HED1+nNKWOEVe1A7In8wAdy/Fq3NcF8Z2+amA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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