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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1829c684e9a0c477f683ca450e355e7101f1c960630bc5311b7b7475661f9a' 
  AND token = 'z2QJ5u9sRlZSWeTKW69YGku5Enc68YPWhVbo2OE4twg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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