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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d58bbc4087f02b3c292c2b839a1cf853abc8e5d0a50e22097928638f405fdb1' 
  AND token = '+6JGuzoMr57FoH97WdH2Yx+SI3sQJ337WrC5sioDzz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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