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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085d2f35b540ff7111f02d847e4d8f4698d9d02f339e42ef6482a837523caf54' 
  AND token = '07EX0x8v4u6ATUeg1Hp1DiqGqsLhgVlG0cYVYPUk7qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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