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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4871ca159fa2d1f3c7fa499a38dd8d0b59ec9c5f2653d866d24d007ff87ca105' 
  AND token = 'BfBOs+MMp/dmw6iJubvsy3OeKoOuZCafXKhS6rq0840=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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