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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c7e3d15ee640bf8a0f15bd848193c7681c7585b9f80d96ee033a464d6f5469' 
  AND token = 'd6zzaXBh+itWapEWoWi2uHyDyGORm4sc4qWu254VMF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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