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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245e0ec73675f98b7afff3a2123965c56ccc350cf7ae62f505c99ab91d1f05a2' 
  AND token = 'e0UpQGA4Oo6iUt4fomKH2aIbydlLwfBR+Z/UhwqOkZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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