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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0996793b39711eab85d9b5157b01392d503e43a11bd831e8d79ccb6b0e6d476a' 
  AND token = 'YoNkAcpGfGubPpLMPVA+JIanba1m8Ywku5965ktuE7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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