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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad77798cd17205c7f46f0042d216d702fe889f8fb1d378f4ad824e54e116464' 
  AND token = 'TRLeH5yeyzMvnQaIXA4mNynT7lkQwz1Up5maw1s0SKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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