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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cab617ca3f1ec0e5d18f0f766380dbc7485924e1ce94039c886226bda14422' 
  AND token = 'uWrsN70IkEEjuLQc4nh8nsq80jZ4eDWbuIEHxi5p3qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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