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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69aa0202c2c1dbe4e898d0ae8eb7a19370314da53240ad45ae17a3a08ac4155' 
  AND token = 'lriSNqoYMSQUZQ4gTNOJ6cFSBe7oPyu7ct31x4lHsqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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