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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f2db28d24906050b4aa1c8d0c64197a0475d99f53fff514a149c7aa71f87ce' 
  AND token = 'ZmEI0Z4TNmXh9P8LaailE9PNKzXytE1zOK6Ja5s2D98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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