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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4a8e0ed347e10bf4ee0567939eac7d4e0214d3f0016541fbfa943e2732d887' 
  AND token = 'R9YtJgwceKTJ+piS04zzNIyIoGheNfPGuDqB63w2bNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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