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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a176bc08a9bd4f0be7c30ca9921f80e38f0b5b76707849c1fa5d3dcc923b999b' 
  AND token = 'Ul02HS1oTYkc7HsVzBu0iRZst+j97WrQyTtqdr0lHJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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