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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf6b88afd3b3afedfca289739cc9e576204930e03d1f2d937b4b4f92a776269' 
  AND token = 'Z0dNBo6fsditzL/D4owQ29MOMPOPms5U2fZSnsW0Ku4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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