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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44842becb74d356070030e4ce722d44616fe8952660fcc171620c2fd8e45b27' 
  AND token = 'PTdHVb80Oz15Tjs0wrvSlrM3cuImMCFZGbjq73KovAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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