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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683fa62394df2be1d27bd826094f09fbf784d24016e98696b0e47ad4301e19ff' 
  AND token = 'C6p7g/TKf2cKcI2HEgn2iVTIm7NV/qTngQ1DlLaaS4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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