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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b4777547ae276929b62fc382a31cf6007de85204c03da3d7bee5345036369d' 
  AND token = 'PHTodGAvGkLTg+qQ0LUbdNcEKG+7LIHTgJaqpuFlIAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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