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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae548d4f351152386afd5c9487e817bc81fa48a69cd6a2cb256f207783c2420' 
  AND token = 'EaqHhOzK4zytekaG4Qga5oDYEOez4LSiSluoPPSFp58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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