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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093e200e5821075d05221f3492152475c220be0ae4285d68993cada3027c6829' 
  AND token = '/VdZVkCv+NX6uJpLkzSWUiqNDo5FKfvDnL90NKwXp2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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