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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40eea91e486595ca52e965d4f60b90553ce6f9a87d8a5ff3c282cc6291abb46' 
  AND token = '33i3Sr1g+LT7Blkl2sNgcQT9X+MIvpspL0L7ajombbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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