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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944cecef7629da46f29998d0d23e697429b2a222fbaea7a194aecd74acb3e9c7' 
  AND token = '9Y/DmovfU6oTctAmdnTVXbMuWHWwHHc2JS7Gp57G/z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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