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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f10dc9fad7b94e0c19588159b4f890deb9c32f64c40491b284e855be8725971' 
  AND token = 'F/B7PDMJdAKn2ApUal0FlTNjoQsMrXel9iVbw1M6iN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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