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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3eadcc55483c68df064d3d19af07786ed2436411dad4261c10441ac842ad13' 
  AND token = 'bM9RgkjmVLXOYPnV0xbmU3mhtK1y4U2Kxx41NUtV/q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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