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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc951c02ad37e4cb77ba5d28191313b528cbd5d027bcc33d88908232b456b99' 
  AND token = '1ZDGhukbEbXlb5U5oeaTcS1l/n/gTYaA7ix0kAZpi6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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