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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33827beb842cc531f2dd16d288a7ce94c038149dc2e3e962e7794d61de08cd42' 
  AND token = 'fwUS8pICxH+GGFngSlZ/eB8rD2zAOmLN87X3hFD79VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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