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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7142cb7d0bf3b0cda65980f00baaee958735b55f793a56164609b075432b7c7' 
  AND token = 'TLGWid6NxDTZyF7le6RJBxU9Cnr+gg8Z4vQjMs2jAp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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