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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234a6327e7376022004e64dd6f2663b00f7a6d581285e5ec9196604967c0ea54' 
  AND token = 'ClmpDQ/rPmCu4+JsdPWTEZnnWnyeNfKUihQOL0uFKq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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