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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c673e95aef71741c8f87b4354a550bcf562f12e03c4a46c5d3bd6d09017e0139' 
  AND token = 'CojF4mXNddt3KXCB4fMLcpep/7w4q8KYXLP5UqJrJJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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