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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f1ea2409f1260a3eddbc68f7d2b1e25e6b27c5398b184aa684737fdfbd9ea3' 
  AND token = 'a809jTchsfbgdHKOzRTuaafKSr/z/gTjfCkUuR+1Jvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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