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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64019628a8dc737253990c221d31005cab9e4444aa27e018914ef802a1fe146' 
  AND token = '5g2nMmaIpa1iD3ox4+Kfr12nG436t5g00NHfU/TZYr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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