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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2ba504c3f061c8ccae5a5ae7527ff7d074db316c3b0f5b9b55ebbbafc77e9b' 
  AND token = 'w53wEEGCt7ENMTQZn9FLB+Myh/9VFMNblVPKjNtq3EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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