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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a84090bafa5d319493e20c82e9650fdfa9156935011c46df1c045d6cb65340' 
  AND token = 'bTmAEBd+636S0ks+RcaaZQ+tIqA0QfGweNdXSCoCjt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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