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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1abd8988035dc6e287fcc1f551524bc4f2c41d3005b6a7a69640a18552e3d2' 
  AND token = 'VL1NMuY9rbWguBwy4yPqxbUMrllfz5FmL9hm3mobops=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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