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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a0b8093bff1fb47ee5e0640d0aba33adc10f4bbb8f7ff36ae11d940c6947e5' 
  AND token = '/uhrRk4l6nkvzmBHX0/VtscHWM019Mn4BxCbPNqME/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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