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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac0debe56f98fcb0787444b4b55894be96a7c1d1f3e67b4f1d2d8593711fc5d' 
  AND token = 'Nu9WRICIt+BdQoj3bvsu5eXxle+PEb1e7L11A60FCkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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