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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873d0ef77875bab1049850ae923b8e3122ba15c4923e58b22d3dc916f37fc551' 
  AND token = 'c5Cjz80Xw+Ycouw5V3llAmwALXAvBSTPZV8wbsX4GfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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