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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d42cf23be033d94b9b5523f0bbdbb9c1506a757478b917035594df088ebfcc' 
  AND token = 'yoNLVtymGU56OuCb/+wSeUcAeS7YjGzbNLVl2CxatXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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