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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192c2a774ab2143fe14f8f87ebaf8fda37fe8ece6fec89aa112a85a60d0f4fe2' 
  AND token = 'vwHhQ9i80rxOqq3YPT1mha0CHzvWZN4aIcf2UBMfD4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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