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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d926407929377fa2020c2d7c2a4cfe60f8621e650475c56162b1260c55e98d3' 
  AND token = 'W+1JNPc8sNu7Mowye5pqbfPJtyMgD0sp52nf+ezUySY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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