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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c12d0516c36510c149956090915692e1ff3ea0d7470d4f02abeb6f82c3cc42' 
  AND token = 'QdL9vC45G6RIJY09UK0m7D0VXaR2Iridb5REaTTHr0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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