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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1aa17f087958bd19adbc3a9bb93df08bc8a5f33f280bd40bb9ae8108d79e177' 
  AND token = 'sWEQZW4RKoOLRO4LZbWudr363W1ootkEWC8v5acEfzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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