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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d7e3548df30ec9782c1e6d538875d77bbf63f321896256bcfe6451b2c05fbc' 
  AND token = 'e0pqRO5yVTu3kkGQX0mlK+GdCiBbdyOVTlk0rzLdstQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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