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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507277fa7aacad922678b4b2b465a55d10af91dd2ba38c8bc8a8fc3a750d493d' 
  AND token = 'Ps3wGR2G67exdvGPgO/x9waQE16mlWhrdkBEH+bU1Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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