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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11caae7eb68a97c5e746ff40b8fdc2c52c91e7e1ae92ecac24f75a2513dce5e7' 
  AND token = 'WdxogkzoD0ZqtgwuijpKbydDjn2/MDif2EvyzOiibPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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