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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4925f34dc144f43016bf6868bf19c863000f0cbebd66176e864da1949a333ff6' 
  AND token = 'qk/41eHp2vcP9Qz1UQEnG9X+IKqMGStn7YKshC9thuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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