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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31c11e9dd72b727ad700daa7ba19802b768a35daba47e235c106fc40a027706' 
  AND token = 'svxnn7NnCXMHXeM7uQqNvACYCJ+vO9KHi9kDKkH+Af0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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