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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a58d6621c76168751d1783a597c07db65205c0210c28b8616249b0ea01f978' 
  AND token = '6jaB1WncmQ4Kc1J4Xk95Bl3QdvGoDv6WR6C3xJInh10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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