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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0826b57bf27f51eccd90dcb910ff643b72c55c652ddfb8b9d55bf3c753746a2a' 
  AND token = '9Fl/bPPMep4/wy14TQ1hg/F/ipz0yN3xxwLOHaalZBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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