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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e300323015d5c4755f78bf914e794f84a7d8ac578f1ad13156fd9ba0cbd1a49' 
  AND token = 'rc4bU4B3qDPElYOF8r5CG0/Uo/W72d5xA+YNkkigoFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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